10 U.S.C. 113 establishes the Secretary of Defense as the head of the Department of Defense, appointed from civilian life by the President with Senate advice and consent. The office’s authority is substantial but operates subject to the President’s direction and governing law. [1]
Appointment restrictions
The statute generally bars appointment within seven years after relief from active duty as a commissioned officer of a regular component, unless applicable legislation provides otherwise. This is a statutory appointment condition, not a rule that every former service member is ineligible. [1]
Direction and control
Section 113 describes authority, direction, and control over the department and assigns policy, planning, reporting, and other responsibilities. Other statutes define the operational chain of command and the roles of military departments and commanders. The Secretary’s authority should not be confused with a power to override any statute or constitutional limit.
Congress retains its role
Senate confirmation is part of appointment, while appropriations, authorizations, reporting requirements, and oversight constrain department action. The Senate explains its nominations process. [2]
For example, directing a department policy does not itself supply an appropriation or erase a statutory restriction on spending.
Read the specific power being invoked
Identify the action, delegation, relevant subsection, other controlling law, and any required report or approval. “The Secretary runs DoD” is not a complete legal basis for every disputed decision.
Operational command is governed by another statute
Section 162 generally describes the operational chain running from the President to the Secretary of Defense and from the Secretary to the combatant commander, unless otherwise directed as the statute permits. That is different from assuming every military department’s administrative responsibilities are identical to operational command. [3]
For a disputed directive, identify who issued it, any delegation, the relevant chain, the authority being used, and the action required. A reporting duty in section 113 does not automatically authorize public release of classified material, while a general management power does not itself displace a separate statutory restriction. Senate confirmation establishes appointment; it does not preapprove every later act. These distinctions help explain civilian control without presenting the office as either powerless or legally unlimited. [1] [2]
See executive orders and legal limits and congressional legislative immunity for separate constitutional mechanisms affecting executive-legislative relations.
Primary sources
Sources checked: October 31, 2026.